My boss' kids have lice

Ever since my boss told me this today I'm paranoid he's gonna bring it to our work place. My biggest fear (although it may be irrational) is lice and fleas. And while I know I can't really avoid it for ever, I'm freaking myself out! They're two of the hardest things to get rid of so I'm having major anxiety! I know it may sound silly....what should I do?!?